Division of Compensation Analysis and 

Support 

Program Evaluation Report

Document Number: DCAS-PER-061

Effective Date: 6/5/2015 

Revision No. 0

Bridgeport Brass Company Page 1 of 2 

Author: Signature on file 

Dave Allen, HP Team Leader

Date: 6/5/2015 

 

Supersedes: None

Approval: Signature on file 

J.W. Neton, Associate Director for Science

Date: 6/5/2015 

 

RECORD OF ISSUE/REVISIONS

ISSUE EFFECTIVE REV. NO. DESCRIPTION

AUTHORIZATION DATE

DATE

New document to determine the effect of 

6/5/2015 6/5/2015 0 the revised Technical Basis Document 

for the Bridgeport Brass sites on 

previously completed claims.

 

1.0 Description 

Revision 2 of the Technical Basis Document (TBD) for the Bridgeport Brass Company 

(ORAUT-TKBS-0030) was issued on 8/9/2013. This TBD covers operations at the 

Adrian Facility in Adrian, Michigan, as well as operations at the Bridgeport Brass 

Havens Laboratory in Bridgeport, Connecticut. The original version (revision 0) was 

issued on 9/15/2005. Revision 1 was issued on 1/24/2013. Revision 2 was issued due to 

a change in the facility designation for the Adrian Facility by the Department of Labor 

(DOL). This PER (DCAS-PER-061) evaluates the effect of revision 2 of the TBD on all 

previously completed claims, which will also include those changes first made in revision 

1.

2.0 Issue Evaluation 

The primary change in revision 2 (and revision 1) was that the external dose was 

analyzed differently than in revision 0. A Monte Carlo approach was utilized in revision 

0, while revision 1 used a method consistent with ORAUT-OTIB-0020. This caused an 

increase in external dose during the operational period at both facilities.

An additional change was made pertaining to thorium intakes. In revision 0, the thorium 

intakes were assigned as a fraction of the uranium intakes. Since the uranium intakes 

were based on urinalysis, this produced a different thorium intake value depending if type 

M or type S uranium was assumed. In revision 1, the thorium intakes were assigned 

based on air samples resulting in the same value independent of the uranium intake 
Division of Compensation Analysis and 

Support

Program Evaluation Plan

Document Number: DCAS-PER-061

Effective Date: 6/5/2015 Revision No. 0 Page 2 of 2

assumptions. This resulted in a higher intake for those cases that had been performed 

using uranium type M. 

These changes affect all years of the operational period at both sites. A search of 

previously completed claims indicate all claims had employment during the operational 

period so no further itemizing of any changes is necessary. 

3.0 Plan for Resolution or Corrective Action 

In order to evaluate the effect of revision 2 of the TBD on previously completed claims, a 

search was conducted for all completed claims that had a probability of causation (POC) 

of less than 50% and employment during the operational period at either site. This search 

identified 14 claims with employment at the Haven’s Lab and 36 claims with 

employment at the Adrian Facility. All 50 claims had employment during the operational 

period for the particular site. 

A new dose estimate was performed for all 50 claims using revision 2 of the TBD as well 

as all applicable approved dose reconstruction methods. The resulting probability of 

causation (POC) was below 45% for 47 claims. The POC was greater than 50% for one 

claim. The remaining 2 claims resulted in a POC between 45% and 50%. For those two 

claims, IREP was run 30 times at 10,000 iterations per NIOSH procedures. The resulting 

POC was less than 50% for both claims. 

NIOSH will provide the Department of Labor with the list of all claims evaluated under 

this PER. Further, NIOSH will request the return of the one claim that would now result 

in a POC greater than 50%.